Microalgae–bacteria consortium treatment technology for municipal wastewater management

Fito, Jemal; Alemu, Keneni

doi:10.1007/s41204-018-0050-2

Cited by 57 publications

(32 citation statements)

References 36 publications

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“…Today, freshwater consumption is increasing rapidly at an unexpected rate due to the fast industrial advancement, world population explosion, mechanized agriculture expansion and progress of civilization (Fito et al 2017a;Fito and Alemu 2019). Basically, in all nations across the globe, access to safe water and sanitation is recognized as a fundamental human right for all (Fito et al 2019a).…”

Section: Introductionmentioning

confidence: 99%

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fito

Said²,

Feleke³

et al. 2019

Environ Syst Res

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Background: Nowadays freshwater quality deterioration and quantity depletion are rapidly increasing across the globe. Especially fluoride polluted groundwater is causing a severe shortage of water supply and public health problem. Hence, this study was designed to investigate the performance of activated carbon produced from the Catha edulis stem for the removal of fluoride from aqueous solution. A C. edulis stem sample was collected from dumping sites of Addis Ababa City and its activation and carbonation processes were performed using H 2 SO 4 and a high temperature of 600 °C. The experimental study was designed to use a full factorial approach with a 3 3 which were the three factors with the three levels, namely pH (2, 7 and 9), contact times (60, 90 and 120 min) and adsorbent doses (0.5 g, 1.0 g and 1.5 g in 100 mL) at the initial fluoride concentration 30 mg/L which resulted in 81 experimental runs in triplicates. Results: The calculated maximum adsorption capacity of 18 mg/g was found under the Langmuir isotherm, whereas the Freundlich model (R 2 0.98) better fitted the experimental data, which indicated that the adsorption process was multilayer and cooperative. The maximum fluoride removal of 73% was observed at the optimum condition of adsorbent dose of 1.5 g in 100 mL contact time of 60 min and pH 2, whereas the predicted value of the fluoride removal of 69% was calculated under the same experimental condition. Fluoride removal was positive and strongly influenced by the adsorbent dose, whereas the adsorption pH was negatively and weakly impacted on removal. Conclusions: Generally, the performance of activated carbon for the removal of fluoride from aqueous solution is promising. The study also indicated that C. edulis activated carbon is a potential candidate for water treatment technology.

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Section: Introductionmentioning

confidence: 99%

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fito

Said²,

Feleke³

et al. 2019

Environ Syst Res

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“…Moreover, the implementation of these methods has some eventual drawbacks in terms of hazardous by-products formation, the large amount of sludge generated, excessive chemical and energy requirements [51]. There has been a growing interest in developing biological treatment systems which are the common procedure for wastewater treatment to eliminate solids, nutrients and organic matter [52,53]. Normally, biological wastewater treatment processes use microorganisms to utilize wastewater pollutants for growth and convert the organic substrate in the wastewater into simpler substances such as CO 2 and water [18].…”

Section: Biological Wastewater Treatment Methodsmentioning

confidence: 99%

Sugarcane biorefineries wastewater: bioremediation technologies for environmental sustainability

Fito

Tefera

Hulle

2019

Chem. Biol. Technol. Agric.

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Sugarcane is known to be one of the oldest cultivated plants in tropical and subtropical countries. Sugar industries are increasing exponentially to satisfy the growing demand for sugar; whereas, the ethanol distilleries have been rapidly expanding, since bioethanol emerged as an affordable, low carbon footprint and renewable bioenergy. However, inadequately treated and indiscriminate disposal of the effluent from sugarcane industries resulted in extensive soil and water pollutions. Hence, this study aimed at reviewing the sugarcane industrial process with its water consumption rates, and effluent characteristics and its adverse effects on the environment. Finally, the study has gone through the most common wastewater treatment efforts made to minimize the effluent environmental burden. In addition to the large volumes of sugar and ethanol industrial effluents, the presence of the different varieties of the pollutants in the effluent is challenging for conventional treatment methods. However, eliminating the pollutants is becoming important for environmental and esthetic values. In line with this, a number of studies encompassing physicochemical and biological treatment methods have been conducted but many of them failed to be effective. Furthermore, alternative treatments have also been developed such as recycling of vinasse, fertirrigation and concentrated by evaporation but they were not effective either due to the high energy use or the large effluent volumes which cannot be managed through such methods. However, anaerobic digestion of high rate was found in the state of the art and an effective approach to treat the sugar industry and ethanol distillery effluents.

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“…The choice of the most suitable microalgal organism is a crucial step in developing an effective microalgae-based tertiary treatment inside WW-TPs. Many studies have focused on the selection of the best candidates among algal strains from culture collections for this application [ 2 , 9 , 13 , 15 ], but concomitantly, increasing attention is being paid to the isolation of autochthonous microalgae, both as monocultures or as alga/alga or alga/bacteria consortia [ 26 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. It is plausible that native microalgae, isolated and thus already adapted to the physico-chemical characteristics of wastewater, can be both more productive and resilient to other organisms present in the water (examples: nitrifying bacteria, pathogens, grazers, parasites) than collection strains [ 7 , 38 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

“…Among UWW effluents from WAS treatments, much attention has been directed towards the employment of centrate streams after the dewatering process or of the surnatant from the anaerobic digestion [ 22 , 33 , 38 , 40 , 42 , 43 ]. Relatively little has been, instead, reported on the employment of the streams derived from the thickening step [ 37 , 44 ]. Thus, it is important to further investigate the use of this wastewater for the cultivation of microalgae, both in terms of concomitant removal of N and P and of possible use as an effective culture medium for the production of algal biomass from a “waste-to-value” perspective.…”

Section: Introductionmentioning

confidence: 99%

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Baldisserotto

Demaria

Accoto

et al. 2020

Plants

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Microalgae are photosynthetic microorganisms and are considered excellent candidates for a wide range of biotechnological applications, including the removal of nutrients from urban wastewaters, which they can recover and convert into biomass. Microalgae-based systems can be integrated into conventional urban wastewater treatment plants (WW-TP) to improve the water depuration process. However, microalgal strain selection represents a crucial step for effective phytoremediation. In this work, a microalga isolated from the effluent derived from the thickening stage of waste sludge of an urban WW-TP was selected and tested to highlight its potential for nutrient removal. Ammonium and phosphate abatements by microalgae were evaluated using both the effluent and a synthetic medium in a comparative approach. Parallelly, the isolate was characterized in terms of growth capability, morphology, photosynthetic pigment content and photosystem II maximum quantum yield. The isolated microalga showed surprisingly high biomass yield and removal efficiency of both ammonium and phosphate ions from the effluent but not from the synthetic medium. This suggests its clear preference to grow in the effluent, linked to the overall characteristics of this matrix. Moreover, biomass from microalgae cultivated in wastewater was enriched in photosynthetic pigments, polyphosphates, proteins and starch, but not lipids, suggesting its possible use as a biofertilizer.

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Microalgae–bacteria consortium treatment technology for municipal wastewater management

Cited by 57 publications

References 36 publications

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Sugarcane biorefineries wastewater: bioremediation technologies for environmental sustainability

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

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